Arthur Conan Doyle’s History of Spiritualism, in two volumes (complete text available online: Vol. I and Vol. II), makes rewarding reading for anyone interested in the early years of parapsychology. That’s not to say there aren’t problems with the book. Doyle’s dogged commitment to the reality of psi phenomena, especially as pertaining to life after death, led him to endorse some questionable characters. In Volume I, he goes to some lengths to establish the Davenport Brothers as legitimate, even though most observers then and later have made then out to be clever frauds. He endorses such dubious activities as slate-writing and spirit photography, and seems genuinely peeved at the efforts of the Society for Psychical Research to tighten up the experimental controls on mediums.
Despite these caveats, the two volumes of his book are well worth a look. There are many fascinating anecdotes, and a good deal of seemingly solid evidence is presented. Doyle’s smooth, lucid prose style makes the pages turn quickly.
One section I found particularly interesting is found in Vol. II, in a chapter titled "Voice Mediumship and Moulds." Here Doyle discusses the practice of producing paraffin molds of spirit forms – faces and hands, usually – in the séance room.
Skeptics understandably dismiss such claims, saying that the medium or an accomplice made the impressions surreptitiously, or that pre-made molds were smuggled into the room and substituted in the dark. This is undoubtedly true in some cases, as in the infamous case of "Margery" (Mina Crandon), who produced a spirit thumbprint that turned out to belong to her all-too-living dentist.
But consider the following series of tests first reported in the magazine Revue Metapsychique in June, 1921. It seems that every reasonable precaution against fraud was taken, yet positive results were obtained. Doyle tells us:
Dr. [Gustave] Geley carried out with [Franek] Kluski a number of remarkable experiments in the formation of wax moulds of materialized hands. He has recorded the results of a series of eleven successful sittings for this purpose. In a dim light the medium’s right hand was held by Professor Richet and his left hand by Count Potocki. A trough containing wax, kept at melting-point by warm water, was placed two feet in front of Kluski, and for the purpose of a test the wax was impregnated (unknown to the medium) with the chemical cholesterin, this to prevent the possibility of substitution. Dr. Geley writes:
The feeble light did not admit of the phenomena being actually seen; we were aware of the moment of dipping, by the sound of splashing in the liquid. The operation involved two or three immersions. The hand that was acting was plunged in the trough, was withdrawn, and, covered with warm paraffin, touched the hands of the controllers of the experiments, and then was plunged again into the wax. After the operation the glove of paraffin, still warm but solidified, was placed against the hand of one of the controllers.
In this way nine moulds were taken: seven of hands, one of a foot, and one of a chin and lips. The wax of which they were composed on being tested gave the characteristic reaction of cholesterin. Dr. Geley shows twenty-three photographs of the moulds and of plaster casts made from them. It may be mentioned that the moulds exhibit the folds of the skin, the nails and the veins, and these markings in nowise resemble those of the medium. Efforts to make similar moulds from the hands of human beings were only partially successful, and the difference from those obtained at the sittings was obvious. Sculptors and moulders of repute have declared that they know of no method of producing wax moulds such as those obtained at the séances with Kluski.
Geley sums up the result thus:
"We will now enumerate the proofs which we have given of the authenticity of the moulds of materialized limbs in our experiments in Paris and Warsaw.
"We have shown that quite apart from the control of the medium, whose two hands were held by us, all fraud was impossible.
"1. The theory of fraud by a rubber glove is inadmissible, for such an attempt gives crude and absurd results which can be seen at a glance to be imitations.
"2. It is not possible to produce such gloves of wax by using a rigid mould already prepared. A trial of this shows at once how impossible it is.
"3. The use of a prepared mould in some fusible and soluble substance, covered with a film of paraffin during the séance and then dissolved out in a pail of water, will not fit in with the actual procedure. We had no pail of water.
"4. The theory that a living hand was used (that of the medium or of an assistant) is inadmissible. This could not have been done, for several reasons, one being that gloves thus obtained are thick and solid, while ours are fine and delicate, also that the position of the fingers in our moulds makes it impossible that they could be withdrawn without breaking the glove. Also that the gloves have been compared with the hands of the medium and of the assistants, and that they are not alike. This is shown also by anthropological measurements.
"Finally, there is the hypothesis that the gloves were brought by the medium. This is disproved by the fact that we secretly introduced chemicals into the melted wax, and that these were found in the gloves.
"The report of the expert modellers on the point is categorical and final."
Nothing is evidence to those who are so filled with prejudice that they have no room for reason, but it is inconceivable that any normally endowed man could read all the above, and doubt the possibility of taking moulds from ectoplasmic figures.
A rebuttal of Geley’s work was presented by two Italian researchers, Massimo Polidoro and Luigi Garlaschelli, who cast doubt on some of his claims. In particular, they showed that thin molds could be obtained rather easily, and that it was possible for a person to twist his hand free of the paraffin without breaking the mold. Their work is important and interesting, but it does not address the most significant claims made by Geley – namely, that the medium’s hands were controlled throughout the séance, and that the paraffin had been pretreated with a certain chemical (without the medium’s knowledge) to expose any attempted substitution.
If substitution is eliminated as a possibility, and if the medium’s hands were properly controlled, then the only remaining non-paranormal explanation is the action of an accomplice, who would make a mold of his own hand. Could Geley have been careless enough to allow a potential accomplice into the séance room, and would this person’s actions pass unnoticed in the dim red light? It seems doubtful.
Skeptics will probably say Kluski fooled the experimenters into believing they had control of both his hands, when actually they were controlling only one. But remember that one of the molds was of a foot, and another was of a partial face ("chin and lips"). Maybe, just maybe, Kluski could have lowered his face into the paraffin, though it seems likely that this action would have been observed, and that some traces of the paraffin would cling to his face afterward.
More important, how would he get his bare foot onto the table and into the trough of paraffin?